[tor-bugs] #11397 [Tor]: Building circuits blocks new connections

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#11397: Building circuits blocks new connections
-----------------------------+--------------------------
     Reporter:  evandro      |      Owner:
         Type:  enhancement  |     Status:  new
     Priority:  normal       |  Milestone:  Tor: 0.2.???
    Component:  Tor          |    Version:
   Resolution:               |   Keywords:
Actual Points:               |  Parent ID:
       Points:               |
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Changes (by nickm):

 * milestone:  Tor: 0.2.6.x-final => Tor: 0.2.???


Comment:

 {{{
 12:11 < athena> slightly worried about a change that makes us potentially
 use
                 an old circuit forever if the firewall starts blocking
 *all*
                 new connections
 12:11 < athena> *maybe* it'd be okay if we introduced soft and hard
 timeouts
                 for circuits
 12:11 <@nickm> with single-guard, you should pretty much always have a
 good
                connection though.
 12:12 < athena> i.e., older than the soft timeout means new connection
 triggers
                 building a new circuit and uses the old if it takes too
 long
 12:12 < athena> hard blocks new connections until a fresh circuit is
 available
 12:12 < athena> hmmm
 12:12 < athena> (we still might have multiple guards if the user changes
 the
                 config setting manually, though, IIUC)
 12:13 <@nickm> that's true, but I'm not sure how much time we should spend
                optimizing for people behind fascist firewalls who also use
                non-default guard settings
 12:13 <@nickm> also, we are supposed to be building circuits preemptively,
 and
                using them preemptively.  So for most people, this
 shouldn't be
                a problem.
 12:13 < athena> also, with single guard, when we build a new circuit, do
 we use
                 the existing channel to the guard to do it, or open a
 whole new
                 channel?
 12:13 < athena> the former, i think
 12:13 <@nickm> we use the existing channel
 12:14 <@nickm> I say that I should copy-and-paste most of this discussion,
 and
                put the ticket in ???
 12:14 < athena> yeah
 }}}

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/11397#comment:2>
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